Active Record错误创建数据库

Question

In my spec/rails_helper.rb , i have the code bellow to create the test database if it doesn`t exits.

def database_exists?
  ActiveRecord::Base.connection rescue ActiveRecord::NoDatabaseError ? false : true
end
unless database_exists?
  ActiveRecord::Base.establish_connection(:"#{ENV['RAILS_ENV']}")
  db_config = ActiveRecord::Base.configurations[ENV['RAILS_ENV']]
  ActiveRecord::Base.connection.create_database db_config
end

but i got this error when rspec is called:

.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/activerecord-4.2.1/lib/active_record/connection_adapters/mysql2_adapter.rb:23:in `rescue in mysql2_connection': Unknown database 'my-db-test' (ActiveRecord::NoDatabaseError)

Where is the problem?

If i use system('rake db:create') , it works, but is a good pratice?

Answer 1

The database doesn't exist so to avoid the error you can run:

rake db:create

or you can run:

rake db:setup

This will create the database AND run the migration files.